Code and Standards Requirements For Acceptance Testing

Code and Standards Requirements For Acceptance Testing

Philip Kresge Vice-President, Local Paving National Ready Mixed Concrete Association

Disclaimer

This presentation has been prepared solely for information purposes. It is intended solely for the use of professional personnel, competent to evaluate the significance and limitations of its content, and who will accept full responsibility for the application of the material it contains. The National Ready Mixed Concrete Association and any other organizations cooperating in the preparation of this presentation strive for accuracy but disclaim any and all responsibility for application of the stated principles or for the accuracy of the content or sources and shall not be liable for any loss or damage arising from reliance on or use of any content or principles contained in this presentation. Unless otherwise indicated, all materials in this presentation are copyrighted to the National Ready Mixed Concrete Association. All rights reserved. Therefore reproduction, modification or retransmission in any form is strictly prohibited without the prior written permission of the National Ready Mixed Concrete Association. ? 2018 National Ready Mixed Concrete Association.

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Purpose of Acceptance Testing

? Concrete supplied complies with specification ? Sampling and testing should comply with standards

? 1 cu.ft. sample represents 10 cubic yards... ? OR 150 cubic yards (depending on frequency)

? Improper procedures generate inaccurate results

? Will cost someone ? Will delay project

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Scope of Testing

? Samples obtained in accordance with ASTM C172

? Point of delivery from transportation unit (or mixer) ? Other sampling methods should be defined

? Fresh Concrete tests

? Slump or slump flow ? tolerances in ASTM C94; ACI 117 ? Air content ? tolerance ?1.5% ? Temperature ? limits in specifications ? Density ? typically no limits unless its lightweight concrete ? Strength specimens

? Average of two 6x12 in or three 4x8 in cylindrical specimens ? Standard cured in accordance with ASTM C31 ? Tested in accordance with ASTM C39 at 28 days or as per spec

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Standard Curing vs. Field Curing

? Quality control

? Developing mixture proportions for strength requirements

? Acceptance testing for specified strength

? Removal of forms or shoring

? Minimum strength for post-tensioning

? Determine if structure can be put into service

? Adequacy of curing and protection

? Compare with standard cured or with other in-place tests

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